A small group of Algerians who fought on the French side of Algeria's war of independence suffered widespread discrimination after the French military abandoned the country. Those who escaped to France didn't fair much better. Fifty years later, they're still waiting for an apology.

In today's Geo Quiz we asked what the five busiest airports are. When it comes to international traffic, the most bustling are: Number 5: Hong Kong, Number 4: Frankfurt, Number 3: Amsterdam, Number 2: the Charles de Gaulle airport in Paris...And the number one busiest airport, it serves 62 million passengers a year, is London's Heathrow Airport.